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A Method for Automatic Horizontal Visibility Retrieval Based on LiDAR Data

A horizontal visibility and laser radar technology, applied in the field of target optical characteristics research, can solve the problems of automatic inversion of ineffective horizontal visibility, etc., achieve the effect of efficient automatic inversion and avoid uncertainty

Active Publication Date: 2017-07-21
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology

[0009] When the lidar is used for horizontal measurement, the selection of the linear area near the ground has a relatively large impact on the calculation of visibility. In the prior art, manual processing is generally used to obtain the horizontal atmospheric visibility using the lidar data, so it cannot be effectively , Stable automatic inversion of horizontal visibility

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  • A Method for Automatic Horizontal Visibility Retrieval Based on LiDAR Data
  • A Method for Automatic Horizontal Visibility Retrieval Based on LiDAR Data
  • A Method for Automatic Horizontal Visibility Retrieval Based on LiDAR Data

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Embodiment Construction

[0050] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0051] This embodiment provides a method for automatically retrieving horizontal visibility based on lidar data.

[0052] In the technical solution of the present invention, the characteristics of the level measurement data of the laser radar can be analyzed.

[0053] When the laser beam emitted by the lidar passes through the atmosphere, it will interact with molecules and aerosols in the atmosphere, among which the effect of scattering is the most obvious. The energy P(r) of the atmospheric scattering echo signal received by the lidar detector at a distance r can be determined by the lidar equation:

[0054]

[0055] Among them, E 0 is the emitted laser pulse energy; c is the speed of light; A r is the effective area of ​​the receiving telescope...

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Abstract

The invention discloses a method for automatically inverting horizontal visibility according to laser radar data. The method includes the steps that horizontal atmosphere optical property measurement is conducted through laser radar, and measured data of the laser radar are obtained; the measured data of the laser radar are processed, and a corresponding range calibration logarithmic function is obtained; a linear region meeting the preset linear characteristic is selected from the range calibration logarithmic function; extinction coefficient inversion is conducted on the selected linear region, the linear fitting slope of the linear region is obtained, and the horizontal visibility is obtained through calculation according to the linear fitting slope. By the adoption of the method for automatically inverting the horizontal visibility according to the laser radar data, the horizontal visibility can be effectively, stably and automatically inverted.

Description

technical field [0001] The invention relates to the research technology of target optical characteristics, in particular to a method for automatically retrieving horizontal visibility based on laser radar data. Background technique [0002] Visibility is the maximum distance at which normal human eyes can find a black target (field angle greater than 30°) with the horizontal sky as the background under a certain atmospheric transparency. Visibility is an important factor in atmospheric detection, which can reflect the stability of the atmosphere and study air pollution. [0003] Visibility measurement methods mainly experienced the development process from manual visual inspection to instrument measurement. Initially, visibility was generally measured by manual visual inspection; with the development of instrument measurement research and development, mathematical camera, transmission, and scattering visibility instruments and laser radar atmospheric visibility measurement ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/53
Inventor 刘兴润李霞刘浩雷浩
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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